Amazon just started running a new promotion where they will give you a free 5,600 mAh Portable Power Bank for trying Amazon Prime. The offer is only available to new customers who start a 30-day FREE Trial of Amazon Prime. Just sign up for Prime and you’ll receive an email within 48-72 hours with a coupon code for the free battery pack. You can cancel your new Prime membership at anytime and keep the battery pack at no cost.